Device for reducing piston slap in internal combustion engines



July 1933. M SQLENBERGER 1,920,].

DEVICE FOR REDUCING PISTON SLAP IN INTERNAL COMBUSTION ENGINES Original Filed July 12, 1928 2 Sheets-Sheet l attorneys July 25, 1933.

D. M. SOLENBERGER DEVICE FOR REDUCING PIsTON SLAP IN INTERNAL COMBUSTION ENGINES Original Filed July 12, 1928 2 Sheets-Sheet 2 Svweufoz J64)? /f. S 0 287/287 er Patented July 25, 1933 UNITED STATES 1,920,114 PATENT OFFICE DEAN M. SOLENIBERGER, OF CLEVELAND, OHIO, ASSIGNOR TO THE SIMPLEX PISTON RING COMPANY OF AMERICA, INC., CORPORATION OF OHIO DEVICE FOR REDUCING PISTON SLA]? IN INTERNAL COMBUSTION ENGINES Application filed July 12, 1928, Serial No. 292,124. Renewed May 6, 1931.

The invention relates to anti-slap devices for loose fitting pistons in cylinders of that type in which a ring is held in eccentric relation to one of said members by an expander exerting a preponderance of pressure in one direction. Heretofore expanders for such purpose have been formed of corrugated metallic ribbon, the corrugations being so proportioned as to exert a preponderance of pressure toward one side. The present invention provides more effective means for exerting the differential pressure by the use of a corrugated ribbon expander of greater thickness on one side than on the other. Thus following the well known physical law that resistance to bending is substantially proportional to the cube of the thickness of the member bent, it is possible to produce any desired differential by merely-varying the thickness of the material and not the shape of the corrugations. A further advantage is that this facilitates the selection of a proper spring scale through which the building up of pressure under lateral deflation is at any desired rate.

Various specific constructions may be devised all of which embody the same essential characteristics. A number of these are illustrated in the drawings in which Figure 1 is a plan view of a corrugated expander formed of an integral metallic ribbon having greater thickness in the portion at one side of the axis than upon the opposite side.

Figure 2 y s a slmilar View showing the thicker portion of the expander formed of two plies of material such plies being secured to each other at one end.

Figure 3 shows a construction similar to Figure 2 in which separate plies are attached to each other by the anchoring pin which positions the expander.

Figure 4 is a similar view with the plies of the expander unattached but reinforcing each other.

Figure 5 is a horizontal section through a piston and cylinder in the plane of the ring groove and showing in connection therewith the expander of the construction in Figure 1.

Referring to Figure 1A is a metallic ribbon which is forged, rolled or ground to have portions thereof varying in thickness. Preferably the ends of the ribbon on opposite sides of the split are of thin gauge. while sides of the expander there will be a great preponderance of pressure in one direction. As shown in Figure 5 the expander is preferably so located in relation to the piston as to exert the preponderance of pressure along the line of axis of the wrist pin. This necessitates some means of holding the expander from rotative displacement which I preferably accomplish by a pin D at one end thereof engaging a recess or bore E in the bottom of the ring groove F. G is the ring in the groove F against which the expander acts and if desired an opposite extension D of the pin D mayengage a recess in the ring to also position this member.

The constructions shown in Figures 2, 3, and 4 increases the resistance to bending and consequently the pressure exerted by the expander on one side through the reinforcement of a plurality of plies. However, the resistance will not be as great with such constructions as where an integral construction is employed.

What I claim as my invention is:

1. The combination with a piston and a cylinder, of a ring in a groove in one of said members and a corrugated ribbon expander between said ring and the bottom of the groove having a greater thickness in one portion thereof than in another portion.

2. The combination with a piston and a cylinder, of a ring engaging a groove in one of said members and bearing against the other member and a corrugated ribbon expander having a portion thereof at one side of the axis of said ring of greater thickness than the portion on the opposite side of said axis to exert a preponderance of pressure in one direction.

DEAN M. SOLENBERGER. 

